EP0766891B1 - Measuring device for the u-interface of an isdn transmission path with full-duplex transmission using the common carrier duplex process - Google Patents

Measuring device for the u-interface of an isdn transmission path with full-duplex transmission using the common carrier duplex process Download PDF

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Publication number
EP0766891B1
EP0766891B1 EP95923182A EP95923182A EP0766891B1 EP 0766891 B1 EP0766891 B1 EP 0766891B1 EP 95923182 A EP95923182 A EP 95923182A EP 95923182 A EP95923182 A EP 95923182A EP 0766891 B1 EP0766891 B1 EP 0766891B1
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EP
European Patent Office
Prior art keywords
interface
transmission path
measuring device
differential amplifier
transmission
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EP95923182A
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German (de)
French (fr)
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EP0766891A1 (en
Inventor
Klaus Hoffmann
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Tektronix Inc
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Tektronix Inc
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/22—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing
    • G06F11/2205—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing using arrangements specific to the hardware being tested
    • G06F11/2221—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing using arrangements specific to the hardware being tested to test input/output devices or peripheral units
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0435—Details
    • H04Q11/045—Selection or connection testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1316—Service observation, testing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13202—Network termination [NT]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13209—ISDN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13302—Magnetic elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1332—Logic circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13322—Integrated circuits

Definitions

  • An ISDN transmission path represents a special one Form of a transmission path with a full duplex transmission in the two-wire equilibrium process.
  • EP 0 009 592 A1 is also known in a connected to a duplex line Transmitter and receiver a difference for the To provide signal reception.
  • the difference-maker becomes two Signals supplied, namely your own broadcast signal of your own Sending and receiving device and that on the duplex line overall signal transmitted, from the own transmission signal and a signal to be received from another transmitter consists.
  • the difference-maker has the task of Total signal of the duplex line to the own transmission signal subtract and in this way receiving exclusively to enable the signal of the other transmitter.
  • a Crosstalk of the own transmission signal into the one to be received So signal is suppressed.
  • the invention relates to a measuring device for the interface a transmission path with a full duplex transmission in the two-wire equilibrium process, in which to the Interface on the one hand a highly integrated interface module via a hybrid circuit and a transformer and on the other hand, a line termination (LT) or a network termination (NT) are connected as a test object.
  • LT line termination
  • NT network termination
  • the invention has for its object physical measurements at the interface during transmission to perform accurately in a comparatively simple way can.
  • an arrangement is used to achieve this object of hybrid circuit, transformer and line or network termination emulating facility available, the one contains high-impedance differential amplifier, the input side with the transmit outputs of the highly integrated interface module and on the output side via another high-impedance Differential amplifier with one input of a subtractor is connected, and one in their electrical properties identical hybrid circuit with the hybrid circuit of the transmission link, one with the transmitter of the transmission link identical transformer and one in its electrical Properties with line or network termination the transmission link has identical termination; a Another input of the subtractor is via an additional one high impedance differential amplifier with the interface connected, and at the output of the subtractor is a measuring system connected to the measuring device.
  • the main advantage of the measuring device according to the invention is that by using the emulating Establishment and the subtractor created the opportunity only examine the signal sent by the respective test object to be able to, because the signals running to the test object and information is filtered out in the subtractor so that at the output of the subtractor only the one sent by the measurement object Signal is present and from a measuring system of the measuring device without further can be evaluated.
  • a transmission link with a Damping device present at the interface contains the replicating device of the measuring device between the identical transformer and the identical degree advantageously one with the damping device of the transmission link identical in their electrical properties Damping device.
  • Figure 1 initially allows a transmission link 1 recognize an interface 2, which is a U interface an ISDN transmission path as a special one Form of a transmission path with a full duplex transmission can act in the two-wire equality procedure.
  • interface 2 On the U interface is a highly integrated in a known manner Interface module 3 connected.
  • this highly integrated interface module 3 over two Transmitter outputs 4 connected to a hybrid circuit 5, which in is usually designed as a hybrid circuit; the hybrid 5 is connected via a downstream transformer 6 the interface 2 connected, on the other hand, a measurement object 7 lies.
  • This measurement object 7 can be a Line termination (LT) or around a network termination (NT) act.
  • LT Line termination
  • NT network termination
  • FIG. 1 also shows, the transmit outputs 4 of the highly integrated interface module 3 a device 8 connected, the input side a high-resistance differential amplifier 9 contains.
  • This high-impedance differential amplifier is a hybrid 10 downstream, which in their electrical properties with the hybrid circuit 5 of the transmission link 1 is identical. Also one of the identical hybrid 10 downstream transformer 11 agrees with that Transmitter 6 of the transmission link 1 match.
  • On the identical Transmitter 11 is connected to a termination 12 which in its electrical properties with the measurement object 7 is identical.
  • the identical end 12 is on the input side another high-impedance differential amplifier 13, the on the output side with an input 14 of a subtractor 15 connected is.
  • Another input 16 of the subtractor 15 is via a additional high-impedance differential amplifier 17 with the Interface 2 connected.
  • a measuring system 19 of the measuring device is connected, that may be suitable for jitter measurement, for example can.
  • an arrow labeled "U hin " indicates that a signal is present at the interface 2 and thus also at the input of the additional high-impedance differential amplifier 17, which is transmitted from the highly integrated interface module 3 the hybrid circuit 5 and the transmitter 6 is transmitted to the test object 7.
  • the signal U back is present at the interface 2, which is emitted by the measurement object 7.
  • both signals U back and U back occur because they have an amplification of 1 and are detected by the subtractor 15 via the input 16.
  • the input 14 of the subtractor 15 is supplied only to the power delivered to the transmitting outputs 4 of the highly integrated interface block 3 signal U out via the differential amplifier 9, the identical fork circuit 10, the identical transformer 11 and the other high-impedance amplifier. 13
  • the signal U back occurs at the output 18 of the subtractor 15, which contains information from or about the measurement object 7 and can therefore be examined in the measurement system 19 for phase jitter, for example.
  • the signal U out therefore does not disturb the measuring system 19.
  • the identical damping device 21 ensures that, in this embodiment of the measuring device according to the invention, a signal U out which corresponds to the signal U out at the interface 2 is fed to the input 14 of the subtractor 15. Only the signal U back is measured by the measuring system.
  • the exemplary embodiment according to FIG. 3 differs from that according to FIG. 2 only in that a damping arrangement 30 corresponding in its electrical properties to the damping device 22 is connected in a simulating device 31 to the output of the further high-impedance differential amplifier 13, which in turn ensures that A signal U is present at the input 14 of the subtractor 15, which corresponds to the corresponding signal at the interface 2, so that in this exemplary embodiment only the signal U back of the measurement object 7 occurs at the output 18 of the subtractor 15.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Dc Digital Transmission (AREA)

Abstract

The invention relates to a measuring device for the interface of a transmission path with full-duplex transmission in the common carrier duplex process in which a highly integrated interface unit is connected to the interface via a hybrid set and a transmitter on the one hand and a line or network termination is connected on the other as a test object. In order to be able with such a measuring device to make measurements on the test object relatively easily and accurately, there is a device (8) imitating the arrangement of hybrid set (5), transmitter (6) and line or network termination (7), which is connected on the input side via a high-ohmic differential amplifier (9) to the highly integrated interface unit and on the output side to one input (14) of a subtractor (15). A further input (16) of the subtractor (15) is connected via an additional differential amplifier (17) to the interface (2) and a measuring system (19) is connected to the output (18) of the subtractor (15).

Description

Es ist bekannt (siehe zum Beispiel US-A-4 989 202), daß eine ISDN(Integrated Services Digital Network)-Übertragungsstrecke zwischen der Übertragungsleitung und einem sog. Netzwerk eine U-Schnittstelle aufweist. Es ist ferner bekannt (vgl. "Siemens-KMT-Report" Nr.14, Bestell-Nr. E 80001-V331-W54, Seiten 6 und 7), an dieser U-Schnittstelle Messungen vorzunehmen und dafür eine entsprechende Meßeinrichtung vorzusehen. Mit dieser können zum Beispiel frequenzabhängige Messungen, funktionale Tests und auch Jitter-Messungen durchgeführt werden. Eine ISDN-Übertragungsstrecke stellt eine spezielle Form einer Übertragungsstrecke mit einer Vollduplex-Übertragung im Zweidrahtgleichlageverfahren dar.It is known (see for example US-A-4 989 202) that a ISDN (Integrated Services Digital Network) transmission link between the transmission line and a so-called network U-interface has. It is also known (cf. "Siemens KMT Report" no.14, order no. E 80001-V331-W54, Pages 6 and 7) to take measurements at this U interface and to provide a corresponding measuring device. With this, for example, frequency-dependent measurements, functional tests and also jitter measurements performed become. An ISDN transmission path represents a special one Form of a transmission path with a full duplex transmission in the two-wire equilibrium process.

Aus der europäischen Patentanmeldung EP 0 009 592 A1 ist ferner bekannt, in einer an eine Duplex-Leitung angeschlossenen Sende- und Empfangseinrichtung einen Differenzbildner für den Signalempfang vorzusehen. Dem Differenzbildner werden zwei Signale zugeführt, nämlich das eigene Sendesignal der eigenen Sende- und Empfangseinrichtung und das auf der Duplex-Leitung übertragene Gesamtsignal, das aus dem eigenen Sendesignal und einem zu empfangenen Signal einer anderen Sendeeinrichtung besteht. Der Differenzbildner hat die Aufgabe, von dem Gesamtsignal der Duplex-Leitung das eigene Sendesignal zu subtrahieren und in dieser Weise das Empfangen ausschließlich des Signals der anderen Sendeeinrichtung zu ermöglichen. Ein Übersprechen des eigenen Sendesignals in das zu empfangene Signal wird also unterdrückt.From European patent application EP 0 009 592 A1 is also known in a connected to a duplex line Transmitter and receiver a difference for the To provide signal reception. The difference-maker becomes two Signals supplied, namely your own broadcast signal of your own Sending and receiving device and that on the duplex line overall signal transmitted, from the own transmission signal and a signal to be received from another transmitter consists. The difference-maker has the task of Total signal of the duplex line to the own transmission signal subtract and in this way receiving exclusively to enable the signal of the other transmitter. A Crosstalk of the own transmission signal into the one to be received So signal is suppressed.

Die Erfindung geht von einer Meßeinrichtung für die Schnittstelle einer Übertragungsstrecke mit einer Vollduplex-Übertragung im Zweidrahtgleichlageverfahren aus, bei der an die Schnittstelle einerseits ein hochintegrierter Schnittstellenbaustein über eine Gabelschaltung und einen Übertrager und andererseits ein Leitungsabschluß (LT) oder ein Netzwerkabschluß (NT) als Meßobjekt angeschlossen sind.The invention relates to a measuring device for the interface a transmission path with a full duplex transmission in the two-wire equilibrium process, in which to the Interface on the one hand a highly integrated interface module via a hybrid circuit and a transformer and on the other hand, a line termination (LT) or a network termination (NT) are connected as a test object.

Der Erfindung liegt die Aufgabe zugrunde, physikalische Messungen an der Schnittstelle während des Übertragungsbetriebes auf vergleichsweise einfache Weise genau durchführen zu können.The invention has for its object physical measurements at the interface during transmission to perform accurately in a comparatively simple way can.

Zur Lösung dieser Aufgabe ist erfindungsgemäß eine die Anordnung von Gabelschaltung, Übertrager und Leitungs- oder Netzwerkabschluß nachbildende Einrichtung vorhanden, die einen hochohmigen Differenzverstärker enthält, der eingangsseitig mit den Sendeausgängen des hochintegrierten Schnittstellenbausteins und ausgangsseitig über einen weiteren hochohmigen Differenzverstärker mit einem Eingang eines Subtrahierers verbunden ist, und eine in ihren elektrischen Eigenschaften mit der Gabelschaltung der Übertragungsstrecke identische Gabelschaltung, einen mit dem Übertrager der Übertragungsstrecke identischen Übertrager und einen in seinen elektrischen Eigenschaften mit dem Leitungs- oder Netzwerkabschluß der Übertragungsstrecke identischen Abschluß aufweist; ein weiterer Eingang des Subtrahierers ist über einen zusätzlichen hochohmigen Differenzverstärker mit der Schnittstelle verbunden, und an den Ausgang des Subtrahierers ist ein Meßsystem der Meßeinrichtung angeschlossen.According to the invention, an arrangement is used to achieve this object of hybrid circuit, transformer and line or network termination emulating facility available, the one contains high-impedance differential amplifier, the input side with the transmit outputs of the highly integrated interface module and on the output side via another high-impedance Differential amplifier with one input of a subtractor is connected, and one in their electrical properties identical hybrid circuit with the hybrid circuit of the transmission link, one with the transmitter of the transmission link identical transformer and one in its electrical Properties with line or network termination the transmission link has identical termination; a Another input of the subtractor is via an additional one high impedance differential amplifier with the interface connected, and at the output of the subtractor is a measuring system connected to the measuring device.

Der wesentliche Vorteil der erfindungsgemäßen Meßeinrichtung besteht darin, daß durch die Verwendung der nachbildenden Einrichtung und des Subtrahierers die Möglichkeit geschaffen ist, nur das vom jeweiligen Meßobjekt gesendete Signal untersuchen zu können, weil die zum Meßobjekt laufenden Signale und Informationen im Subtrahierer ausgefiltert werden, so daß am Ausgang des Subtrahierers nur das vom Meßobjekt gesendete Signal ansteht und von einem Meßsystem der Meßeinrichtung ohne weiteres ausgewertet werden kann.The main advantage of the measuring device according to the invention is that by using the emulating Establishment and the subtractor created the opportunity only examine the signal sent by the respective test object to be able to, because the signals running to the test object and information is filtered out in the subtractor so that at the output of the subtractor only the one sent by the measurement object Signal is present and from a measuring system of the measuring device without further can be evaluated.

Um die Vorteile der erfindungsgemäßen Meßeinrichtung auch dann zu erreichen, wenn eine Übertragungsstrecke mit einer Dämpfungseinrichtung an der Schnittstelle vorliegt, enthält die nachbildende Einrichtung der Meßeinrichtung zwischen dem identischen Übertrager und dem identischen Abschluß vorteilhafterweise eine mit der Dämpfungseinrichtung der Übertragungsstrecke in ihren elektrischen Eigenschaften identische Dämpfungseinrichtung.To the advantages of the measuring device according to the invention also to be achieved if a transmission link with a Damping device present at the interface contains the replicating device of the measuring device between the identical transformer and the identical degree advantageously one with the damping device of the transmission link identical in their electrical properties Damping device.

Gegebenenfalls kann es auch vorteilhaft sein, bei einer Übertragungsstrecke mit einer Dämpfungseinrichtung an der Schnittstelle in der nachbildenden Einrichtung der Meßeinrichtung dem weiteren hochohmigen Differenzverstärker eine in ihrer Wirkung mit der Dämpfungseinrichtung der Übertragungsstrecke identische Dämpfungsanordnung nachzuschalten.It may also be advantageous if there is a transmission link with a damping device on the Interface in the replicating device of the measuring device the further high-impedance differential amplifier an in their effect with the damping device of the transmission link to connect an identical damping arrangement.

Zur Erläuterung der Erfindung ist in

Figur 1
ein Ausführungsbeispiel der erfindungsgemäßen Meßeinrichtung, in
Figur 2
ein weiteres Ausführungsbeispiel der erfindungsgemäßen Meßeinrichtung bei einer mit einer Dämpfungseinrichtung versehenen ISDN(Integrated Services Digital Network)-Übertragungsstrecke und in
Figur 3
ein zusätzliches Ausführungsbeispiel der erfindungsgemäßen Meßeinrichtung bei einer mit einer Dämpfungseinrichtung versehenen ISDN(Integrated Services Digital Network)-Übertragungsstrecke dargestellt.
To explain the invention is in
Figure 1
an embodiment of the measuring device according to the invention, in
Figure 2
a further embodiment of the measuring device according to the invention in an ISDN (Integrated Services Digital Network) transmission link provided with a damping device and in
Figure 3
an additional embodiment of the measuring device according to the invention is shown in an ISDN (Integrated Services Digital Network) transmission link provided with a damping device.

Figur 1 läßt zunächst einmal eine Übertragungsstrecke 1 mit einer Schnittstelle 2 erkennen, bei der es sich um eine U-Schnittstelle einer ISDN-Übertragungsstrecke als einer speziellen Form einer Übertragungsstrecke mit einer Vollduplex-Übertragung im Zweidrahtgleichlageverfahren handeln kann. An die U-Schnittstelle ist in bekannter Weise ein hochintegrierter Schnittstellenbaustein 3 angeschlossen. Im einzelnen ist dieser hochintegrierte Schnittstellenbaustein 3 über zwei Sendeausgänge 4 mit einer Gabelschaltung 5 verbunden, die in der Regel als Hybrid-Schaltung ausgebildet ist; die Gabelschaltung 5 ist über einen nachgeordneten Übertrager 6 mit der Schnittstelle 2 verbunden, an der andererseits ein Meßobjekt 7 liegt. Bei diesem Meßobjekt 7 kann es sich um einen Leitungsabschluß (LT) oder um einen Netzwerkabschluß (NT) handeln.Figure 1 initially allows a transmission link 1 recognize an interface 2, which is a U interface an ISDN transmission path as a special one Form of a transmission path with a full duplex transmission can act in the two-wire equality procedure. On the U interface is a highly integrated in a known manner Interface module 3 connected. In detail this highly integrated interface module 3 over two Transmitter outputs 4 connected to a hybrid circuit 5, which in is usually designed as a hybrid circuit; the hybrid 5 is connected via a downstream transformer 6 the interface 2 connected, on the other hand, a measurement object 7 lies. This measurement object 7 can be a Line termination (LT) or around a network termination (NT) act.

Wie die Figur 1 ferner zeigt, ist an die Sendeausgänge 4 des hochintegrierten Schnittstellenbausteins 3 eine Einrichtung 8 angeschlossen, die eingangsseitig einen hochohmigen Differenzverstärker 9 enthält. Diesem hochohmigen Differenzverstärker ist eine Gabelschaltung 10 nachgeordnet, die in ihren elektrischen Eigenschaften mit der Gabelschaltung 5 der Übertragungsstrecke 1 identisch ist. Auch ein der identischen Gabelschaltung 10 nachgeordneter Übertrager 11 stimmt mit dem Übertrager 6 der Übertragungsstrecke 1 überein. An den identischen Übertrager 11 ist ein Abschluß 12 angeschlossen, der in seinen elektrischen Eigenschaften mit dem Meßobjekt 7 identisch ist. An dem identischen Abschluß 12 liegt eingangsseitig ein weiterer hochohmiger Differenzverstärker 13, der ausgangsseitig mit einem Eingang 14 eines Subtrahierers 15 verbunden ist.As FIG. 1 also shows, the transmit outputs 4 of the highly integrated interface module 3 a device 8 connected, the input side a high-resistance differential amplifier 9 contains. This high-impedance differential amplifier is a hybrid 10 downstream, which in their electrical properties with the hybrid circuit 5 of the transmission link 1 is identical. Also one of the identical hybrid 10 downstream transformer 11 agrees with that Transmitter 6 of the transmission link 1 match. On the identical Transmitter 11 is connected to a termination 12 which in its electrical properties with the measurement object 7 is identical. At the identical end 12 is on the input side another high-impedance differential amplifier 13, the on the output side with an input 14 of a subtractor 15 connected is.

Ein weiterer Eingang 16 des Subtrahierers 15 ist über einen zusätzlichen hochohmigen Differerenzverstärker 17 mit der Schnittstelle 2 verbunden. An einen Ausgang 18 des Subtrahierers 15 ist ein Meßsystem 19 der Meßeinrichtung angeschlossen, das beispielsweise zur Jitter-Messung geeignet sein kann.Another input 16 of the subtractor 15 is via a additional high-impedance differential amplifier 17 with the Interface 2 connected. To an output 18 of the subtractor 15 a measuring system 19 of the measuring device is connected, that may be suitable for jitter measurement, for example can.

In der Figur 1 ist im Bereich der Schnittstelle 2 durch einen Pfeil mit der Bezeichnung "Uhin" zum Ausdruck gebracht, daß an der Schnittstelle 2 und damit auch am Eingang des zusätzlichen hochohmigen Differenzverstärkers 17 ein Signal ansteht, das von dem hochintegrierten Schnittstellenbaustein 3 über die Gabelschaltung 5 und den Übertrager 6 zum Meßobjekt 7 hin übertragen wird. Außerdem steht an der Schnittstelle 2 das Signal Urück an, das von dem Meßobjekt 7 ausgesendet wird. Am Ausgang des zusätzlichen Differenzverstärkers 17 treten dadurch - weil diese eine Verstärkung von 1 aufweist - beide Signale Uhin und Urück auf und werden über den Eingang 16 vom Subtrahierer 15 erfaßt. Dem Eingang 14 des Subtrahierers 15 wird aber nur das an den Sendeausgängen 4 des hochintegrierten Schnittstellenbausteins 3 abgegebene Signal Uhin über den Differenzverstärker 9, die identische Gabelschaltung 10, den identischen Übertrager 11 und den weiteren hochohmigen Verstärker 13 zugeführt. Infolge Differenzbildung tritt am Ausgang 18 des Subtrahierers 15 daher nur das Signal Urück auf, das Informationen von dem bzw. über das Meßobjekt 7 enthält und damit in dem Meßsystem 19 beispielsweise auf Phasenjitter untersucht werden kann. Das Signal Uhin stört daher das Meßsystem 19 nicht.In FIG. 1, in the area of the interface 2, an arrow labeled "U hin " indicates that a signal is present at the interface 2 and thus also at the input of the additional high-impedance differential amplifier 17, which is transmitted from the highly integrated interface module 3 the hybrid circuit 5 and the transmitter 6 is transmitted to the test object 7. In addition, the signal U back is present at the interface 2, which is emitted by the measurement object 7. At the output of the additional differential amplifier 17, both signals U back and U back occur because they have an amplification of 1 and are detected by the subtractor 15 via the input 16. The input 14 of the subtractor 15 but is supplied only to the power delivered to the transmitting outputs 4 of the highly integrated interface block 3 signal U out via the differential amplifier 9, the identical fork circuit 10, the identical transformer 11 and the other high-impedance amplifier. 13 As a result of the formation of a difference, only the signal U back occurs at the output 18 of the subtractor 15, which contains information from or about the measurement object 7 and can therefore be examined in the measurement system 19 for phase jitter, for example. The signal U out therefore does not disturb the measuring system 19.

Das Ausführungsbeispiel nach Figur 2, in dem mit dem Ausführungsbeispiel nach Figur 1 übereinstimmende Bausteine mit gleichen Bezugszeichen versehen sind, unterscheidet sich von dem nach Figur 1 dadurch, daß in der nachbildenden Einrichtung 20 zwischen dem identischen Übertrager 11 und dem Abschluß 12 eine Dämpfungseinrichtung 21 angeordnet ist, die identisch mit einer Dämpfungseinrichtung 22 in der Übertragungsstrecke 23 zwischen dem Übertrager 6 und der Schnittstelle 2 ist. Die identische Dämpfungseinrichtung 21 stellt sicher, daß auch bei dieser Ausführungsform der erfindungsgemäßen Meßeinrichtung dem Eingang 14 des Subtrahierers 15 ein Signal Uhin zugeführt wird, das dem Signal Uhin an der Schnittstelle 2 entspricht. Gemessen wird von dem Meßsystem nur das Signal Urück.The exemplary embodiment according to FIG. 2, in which components corresponding to the exemplary embodiment according to FIG. 1 are provided with the same reference numerals, differs from that according to FIG. 1 in that a damping device 21 is arranged in the reproducing device 20 between the identical transformer 11 and the termination 12 which is identical to a damping device 22 in the transmission path 23 between the transmitter 6 and the interface 2. The identical damping device 21 ensures that, in this embodiment of the measuring device according to the invention, a signal U out which corresponds to the signal U out at the interface 2 is fed to the input 14 of the subtractor 15. Only the signal U back is measured by the measuring system.

Das Ausführungsbeispiel nach Figur 3 unterscheidet sich von dem nach Figur 2 lediglich dahingehend, daß eine in ihren elektrischen Eigenschaften der Dämpfungseinrichtung 22 entsprechende Dämpfungsanordnung 30 in einer nachbildenden Einrichtung 31 an den Ausgang des weiteren hochohmigen Differenzverstärkers 13 angeschlossen ist, wodurch wiederum dafür gesorgt ist, daß am Eingang 14 des Subtrahierers 15 ein Signal Uhin ansteht, das dem entsprechenden Signal an der Schnittstelle 2 entspricht, so daß auch bei diesem Ausführungsbeispiel am Ausgang 18 des Subtrahierers 15 nur das Signal Urück des Meßobjektes 7 auftritt.The exemplary embodiment according to FIG. 3 differs from that according to FIG. 2 only in that a damping arrangement 30 corresponding in its electrical properties to the damping device 22 is connected in a simulating device 31 to the output of the further high-impedance differential amplifier 13, which in turn ensures that A signal U is present at the input 14 of the subtractor 15, which corresponds to the corresponding signal at the interface 2, so that in this exemplary embodiment only the signal U back of the measurement object 7 occurs at the output 18 of the subtractor 15.

Claims (3)

  1. A measuring device for the interface (2) of a transmission path (1) with full-duplex transmission using the common carrier duplex process, in which what is connected to the interface (2) is a highly integrated interface component (3) via a hybrid set (5) and a transformer (6) on the one hand, and a line terminal (LT) or a network terminal (NT) as a test object (7) on the other hand,
    characterized in
    that
    means (8) imitating the arrangement of hybrid set (5), transformer (6) and line or network terminal (7) is provided which includes
    a high-impedance differential amplifier (9) which has its input connected to the send outputs (4) of the interface component (3) and has its outputs connected to an input (14) of a subtracter (15) via a further high-impedance differential amplifier (13), and includes
    a hybrid set (10) which is identical in its electrical properties to the hybrid set (5) of the transmission path (1), a transformer (11) identical to the transformer (6) of the transmission path (1) as well as a terminal (12) which is identical in its electrical properties to the line or network terminal (7) of the transmission path (1),
    a further input (16) of the subtracter (15) is connected to the interface (2) via an additional high-impedance differential amplifier (17), and
    connected to the output (18) of the subtracter (13) is a measuring system (19) of the measuring means.
  2. The measuring device as claimed in claim 1
    characterized in
    that
    in a transmission path (23) with an attenuation device (22) at the interface (2), the imitating means (20) of the measuring means has an attenuation device (21) which is identical in its electrical properties to the attenuation device (22) of the transmission path and which is provided between the identical transformer (11) and the identical terminal (12).
  3. The measuring device as claimed in claim 1
    characterized in
    that
    in a transmission path (23) with an attenuation device (22) at the interface (2), in the imitating device (31) of the measuring means, an attenuation array (30) identical in its effect to the attenuation device (22) of the transmission path (23) is post-connected to the further high-impedance differential amplifier (13).
EP95923182A 1994-06-21 1995-06-20 Measuring device for the u-interface of an isdn transmission path with full-duplex transmission using the common carrier duplex process Expired - Lifetime EP0766891B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4423333A DE4423333C1 (en) 1994-06-21 1994-06-21 Measuring device for integrated services digital transmission network transmission path interface
DE4423333 1994-06-21
PCT/DE1995/000836 WO1995035607A1 (en) 1994-06-21 1995-06-20 Measuring device for the interface of a transmission path with full-duplex transmission in the common carrier duplex process

Publications (2)

Publication Number Publication Date
EP0766891A1 EP0766891A1 (en) 1997-04-09
EP0766891B1 true EP0766891B1 (en) 1999-07-28

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EP95923182A Expired - Lifetime EP0766891B1 (en) 1994-06-21 1995-06-20 Measuring device for the u-interface of an isdn transmission path with full-duplex transmission using the common carrier duplex process

Country Status (4)

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US (1) US5936946A (en)
EP (1) EP0766891B1 (en)
DE (2) DE4423333C1 (en)
WO (1) WO1995035607A1 (en)

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DE19650833C1 (en) * 1996-11-29 1998-03-26 Siemens Communications Test Eq Measurement apparatus for full-duplex two-wire transmission interface
DE19709710C1 (en) * 1997-03-10 1998-10-01 Siemens Ag So interface for an ISDN basic connection
DE19947990A1 (en) * 1999-10-06 2001-04-12 Deutsche Telekom Ag Device for testing communications connection has interface enabling connection of test equipment, arrangement for activating loop in network terminating device of subscriber connection
US6704277B1 (en) 1999-12-29 2004-03-09 Intel Corporation Testing for digital signaling
DE10131905B4 (en) * 2001-07-04 2005-05-19 Wampfler Aktiengesellschaft Device for inductive transmission of electrical energy
US20060089692A1 (en) * 2004-10-21 2006-04-27 Medtronic, Inc. Implantable medical lead with stylet guide tube

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DE2839875C2 (en) * 1978-09-13 1984-03-29 Siemens AG, 1000 Berlin und 8000 München Method for testing a news station
IT1162836B (en) * 1983-03-04 1987-04-01 Cselt Centro Studi Lab Telecom NUMERICAL RECEIVER FOR SIMULTANEOUS BIDIRECTIONAL TRANSMISSION OF LOGICAL SIGNALS ON A SINGLE LINE
US4638473A (en) * 1984-12-28 1987-01-20 Gte Laboratories Incorporated Two wire bidirectional digital transmission system
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Also Published As

Publication number Publication date
EP0766891A1 (en) 1997-04-09
US5936946A (en) 1999-08-10
DE59506482D1 (en) 1999-09-02
WO1995035607A1 (en) 1995-12-28
DE4423333C1 (en) 1995-08-31

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